THE 3 rd INTERNATIONAL SCIENTIFIC CONFERENCES OF STUDENTS AND YOUNG RESEARCHERS dedicated to the 99
th
anniversary of the National Leader of Azerbaijan Heydar Aliyev
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In the 4 digit 7 segment numbers from 0 to nine and even some letters,
decimal point can be displayed. There is multiplexing data technique which
makes human see all four segment operations simultaneously. And for
making enable digit select from RA0 to RA3 pins are used. However, data
lines are connected to from RD0 to RD7 pins.
DS1820 is digital temperature sensor. It can measure temperature from
-55 to 128
o
C. Data can transferred only 1 wire. For enabling communication
between sensor and microcontroller RA4 or RE2 pin. J11 jumper will help
here to connect either one of them.
LM35 is analog sensor in the EasyPIC v7 board. Voltage output of the
sensor is proportional to the Celsius. And it can measure from +2 to 150
o
C.
For reading the data from the sensor RE1 or RE2 pins are used. When one
of them is selected J25 jumper is used.
Local Area Network (LAN) is network that enable common
communication among computers and different devices. In this project it is
created between 2 microcontrollers in different boards. As it is seen from the
picture the communication protocol for it is SPI. There are some option for
communication [ [2]]:
Communication protocol
Baud rate
Distance between devices
I2C
100kbps
3.7m
RS-232
110bps-115200bps
15 m
RS-485
Up to 10mbps
1200 m
Ethernet
10,000mbps
100m
SPI
Up to 10mbps
Up to 10m
As it is seen from the table in our case for review in lab condition SPI is
best one. Because It has much better speed for less distances. In our lab
distance will also be little.
For programming purposes mikroProg with mikroICD in-circuit debugger
is used. However as a compiles mikroC is utilized.